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This is just a sum-up of what we should do when we try to estimate the group-level variances and correlations but the software failed to do so. As a R and lmer() user, I found this happens often.If this is the case, there are three potential problems...

This is just a sum-up of what we should do when we try to estimate the group-level variances and correlations but the software failed to do so. As a R and lmer() user, I found this happens often.If this is the case, there are three potential problems...

I should have posted this earlier. In my previous post, I have discussed the speed issue in R briefly. The speed issue unfortunately are two of the shortcomings of R. The other one is that R does not handle big data set very well. So instead of wai...

I should have posted this earlier. In my previous post, I have discussed the speed issue in R briefly. The speed issue unfortunately are two of the shortcomings of R. The other one is that R does not handle big data set very well. So instead of wai...

Recently, I tried to learn C language so that I can write a C addon for some R rountines to redress the speed issue in R. In my last post here, I have documented how a simple trick can speed up R. Nonetheless, I had an example which shows that smart...

Recently, I tried to learn C language so that I can write a C addon for some R rountines to redress the speed issue in R. In my last post here, I have documented how a simple trick can speed up R. Nonetheless, I had an example which shows that smart...

This is another example of why defaults matter a lot. I got an email of Evan Cooch forward by Matt, saying that there exists a trick to speed up R matrix caculation. He found that if we replace the default Rblas.dll in R with the proper one. It can b...

This is another example of why defaults matter a lot. I got an email of Evan Cooch forward by Matt, saying that there exists a trick to speed up R matrix caculation. He found that if we replace the default Rblas.dll in R with the proper one. It can b...

I have wrote about my experience with jags here. Martyn Plummer has updated jags recently and now jags can get as he claimed. Jags is fast and its source code is more manipulable (It's written in C++).I and Masanao wrote a package, R2jags, for runnin...

I have wrote about my experience with jags here. Martyn Plummer has updated jags recently and now jags can get as he claimed. Jags is fast and its source code is more manipulable (It's written in C++).I and Masanao wrote a package, R2jags, for runnin...